<!DOCTYPE html>
<html>
<head>
    <script src="../build/react.js"></script>
    <script src="../build/react-dom.js"></script>
    <script src="../build/browser.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">

    function UserGreeting(props) {
        return <h1>Welcome back!</h1>;
    }

    function GuestGreeting(props) {
        return <h1>Please sign up.</h1>;
    }

    function Greeting(props) {
        const isLoggedIn = props.isLoggedIn;
        if (isLoggedIn) {
            return <UserGreeting />;
        }
        return <GuestGreeting />;
    }

    function LoginButton(props) {
        return (
                <button onClick={props.onClick}>
                    Login
                </button>
        );
    }

    function LogoutButton(props) {
        return (
                <button onClick={props.onClick}>
                    Logout
                </button>
        );
    }

    class LoginControl extends React.Component {
        constructor(props) {
            super(props);
            this.handleLoginClick = this.handleLoginClick.bind(this);
            this.handleLogoutClick = this.handleLogoutClick.bind(this);
            this.state = {isLoggedIn: false};
        }

        handleLoginClick() {
            this.setState({isLoggedIn: true});
        }

        handleLogoutClick() {
            this.setState({isLoggedIn: false});
        }

        render() {
            const isLoggedIn = this.state.isLoggedIn;

            let button = null;
            if (isLoggedIn) {
                button = <LogoutButton onClick={this.handleLogoutClick} />;
            } else {
                button = <LoginButton onClick={this.handleLoginClick} />;
            }

            return (
                    <div>
                        <Greeting isLoggedIn={isLoggedIn} />
                        {button}
                    </div>
            );
        }
    }

    ReactDOM.render(
            <LoginControl />,
        document.getElementById('example')
    );


</script>
</body>
</html>

